B:

Thanks for the description of Cogitos twist mechanism. Sounds a bit complicated to get right, but I suppose that is "the way of the wing".
Your description of the assymetrical foils was most interesting! If you can, some numbers on performance difference between symmetrical and assymetrical foils would be good.

Sorry for the late reply. Have been away sailing.. <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />